求教，C++程序不会写，求大神教一下，再次跪谢：报错

我只想知道两个点是怎么确定一个矩形的？######回复 @Akkk47 : 对角是可以确定矩形######回复 @木兰宿莽 : 哈哈哈，代码我写不下去了，一直出错，等待你的代码######回复 @二胜 : 。。。看成平行四边形了，矩形是可以######回复 @木兰宿莽 : 不会写啊，可以帮我写一下吗，谢谢大神啊######回复 @木兰宿莽 : 老师说对角的两个点就可以确定一个矩形了#######include<iostream>

using std::cout;

using std::endl;

using std::cin;

class Point

{

private:

float x,y;

public:

Point():x(0.0f),y(0.0f){}

Point& operator=(const Point& rp){

this->x=rp.x;

this->x=rp.y;

return *this;

}

Point& operator()(const Point& rp){

   this->x=rp.x;

this->y=rp.y;

return *this;

}

Point(float rx,float ry):x(rx),y(ry){}

~Point(){}

public:

float getX(){return this->x;}

    float getY(){return this->y;}

};

class Rectangle

{

private:

Point pointFirst;

Point pointSecond;

public:

Rectangle():pointFirst(0.0f,0.0f),pointSecond(1.0f,1.0f){}

Rectangle(Point p1,Point p2=Point(1.0f,1.0f)):pointFirst(p1),pointSecond(p2){}

public:

float isArea(){

       return (pointFirst.getX()-pointSecond.getX())*(pointFirst.getY()-pointSecond.getY());

    }

};

int main()

{

Rectangle rct1;

        Point p1(0.0f,0.0f);

        Point p2(4.0f,4.0f);

        Rectangle rct2(p1,p2);

cout<<rct1.isArea()<<endl;

cout<<rct2.isArea()<<endl;

return 0;

}

######完成了80%的功能吧，自己看懂，然后补充完成